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// SPDX-License-Identifier: MIT
pragma solidity 0.8.28;

import "../lib/Babylonian.sol";
import "../lib/FixedPoint.sol";
import "../lib/UniswapV2OracleLibrary.sol";
import "../utils/Epoch.sol";
import "../interfaces/IUniswapV2Pair.sol";

/**
 * @title GreenOracle
 * @notice A fixed window Uniswap V2 oracle for computing the average price of a pair over a given period.
 *         This oracle updates its average price once per epoch (window) and supports a minimum window length.
 *         The price returned is guaranteed to be an average over at least one full epoch.
 */
contract GreenOracle is Epoch {
    using FixedPoint for *;

    // Factor to adjust for differing decimals.
    // For example, if the GREEN token has 18 decimals and USDC.e has 6, then 1e12 scales USDC.e to 18 decimals.
    uint144 private constant GREEN_DECIMALS_FACTOR = 1e12;

    /* ========== STATE VARIABLES ========== */

    // Uniswap V2 pair details.
    address public token0;
    address public token1;
    IUniswapV2Pair public pair;
    address public green; // The GREEN token address.

    // Oracle state variables.
    uint32 public _lastTimestamp;            // Last timestamp when reserves were recorded.
    uint256 public price0CumulativeLast;       // Last recorded cumulative price for token0.
    uint256 public price1CumulativeLast;       // Last recorded cumulative price for token1.
    FixedPoint.uq112x112 public price0Average;   // Average price for token0 over the epoch.
    FixedPoint.uq112x112 public price1Average;   // Average price for token1 over the epoch.

    /* ========== CONSTRUCTOR ========== */

    /**
     * @notice Creates a new GreenOracle instance.
     * @param _pair The Uniswap V2 pair (e.g., GREEN/USDC.e).
     * @param _green The GREEN token address.
     * @param _period The epoch period (in seconds) over which the price is averaged.
     * @param _startTime The timestamp when the oracle should start operating.
     */
    constructor(
        IUniswapV2Pair _pair,
        address _green,
        uint256 _period,
        uint256 _startTime
    ) Epoch(_period, _startTime, 0) {
        pair = _pair;
        green = _green;
        token0 = pair.token0();
        token1 = pair.token1();

        // Initialize cumulative prices and timestamp from the pair.
        price0CumulativeLast = pair.price0CumulativeLast();
        price1CumulativeLast = pair.price1CumulativeLast();

        // Retrieve reserves to ensure the pair has liquidity.
        uint112 reserve0;
        uint112 reserve1;
        (reserve0, reserve1, _lastTimestamp) = pair.getReserves();
        require(reserve0 != 0 && reserve1 != 0, "GreenOracle: NO_RESERVES");
    }

    /* ========== MUTABLE FUNCTIONS ========== */

    /**
     * @notice Updates the average prices for token0 and token1 over the current epoch.
     * @dev This function should be called once per epoch (enforced by the Epoch modifier).
     *      It uses the UniswapV2OracleLibrary to obtain current cumulative prices and calculates the average.
     *      Overflow in the cumulative price difference is intentional.
     */
    function update() external checkEpoch {
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 currentTimestamp) =
                            UniswapV2OracleLibrary.currentCumulativePrices(address(pair));
        uint32 timeElapsed = currentTimestamp - _lastTimestamp; // Overflow is desired.

        if (timeElapsed == 0) {
            // Avoid division by zero if no time has elapsed.
            return;
        }

        // Compute the average prices over the elapsed time.
        price0Average = FixedPoint.uq112x112(uint224((price0Cumulative - price0CumulativeLast) / timeElapsed));
        price1Average = FixedPoint.uq112x112(uint224((price1Cumulative - price1CumulativeLast) / timeElapsed));

        // Update state for the next epoch.
        price0CumulativeLast = price0Cumulative;
        price1CumulativeLast = price1Cumulative;
        _lastTimestamp = currentTimestamp;

        emit Updated(price0Cumulative, price1Cumulative);
    }

    /**
     * @notice Returns the amount of output tokens for a given input amount based on the stored average price.
     * @dev Before the first successful update, this function returns 0.
     * @param _token The input token address (should be token0 or token1).
     * @param _amountIn The input amount.
     * @return _amountOut The output amount calculated from the average price.
     */
    function consult(address _token, uint256 _amountIn) external view returns (uint144 _amountOut) {
        if (_token == token0) {
            _amountOut = price0Average.mul(_amountIn).decode144();
        } else {
            require(_token == token1, "GreenOracle: INVALID_TOKEN");
            _amountOut = price1Average.mul(_amountIn).decode144();
        }
        // Adjust the output amount based on GREEN's decimals relative to USDC.e.
        if (_token == green) {
            _amountOut *= GREEN_DECIMALS_FACTOR;
        } else {
            _amountOut /= GREEN_DECIMALS_FACTOR;
        }
    }

    /**
     * @notice Returns the time-weighted average price (TWAP) for a given input amount.
     * @dev This function calculates the TWAP using the current cumulative prices from Uniswap.
     * @param _token The input token address (should be token0 or token1).
     * @param _amountIn The input amount.
     * @return _amountOut The output amount calculated from the TWAP.
     */
    function twap(address _token, uint256 _amountIn) external view returns (uint144 _amountOut) {
        (uint256 price0Cumulative, uint256 price1Cumulative, uint32 currentTimestamp) =
                            UniswapV2OracleLibrary.currentCumulativePrices(address(pair));
        uint32 timeElapsed = currentTimestamp - _lastTimestamp; // Overflow is desired.

        if (_token == token0) {
            _amountOut = FixedPoint.uq112x112(uint224((price0Cumulative - price0CumulativeLast) / timeElapsed))
                .mul(_amountIn)
                .decode144();
        } else if (_token == token1) {
            _amountOut = FixedPoint.uq112x112(uint224((price1Cumulative - price1CumulativeLast) / timeElapsed))
                .mul(_amountIn)
                .decode144();
        }
        // Adjust the output amount based on GREEN's decimals.
        if (_token == green) {
            _amountOut *= GREEN_DECIMALS_FACTOR;
        } else {
            _amountOut /= GREEN_DECIMALS_FACTOR;
        }
    }

    /* ========== EVENTS ========== */

    /**
     * @notice Emitted when the oracle updates its cumulative prices.
     * @param price0CumulativeLast The new cumulative price for token0.
     * @param price1CumulativeLast The new cumulative price for token1.
     */
    event Updated(uint256 price0CumulativeLast, uint256 price1CumulativeLast);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (access/Ownable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * The initial owner is set to the address provided by the deployer. This can
 * later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    address private _owner;

    /**
     * @dev The caller account is not authorized to perform an operation.
     */
    error OwnableUnauthorizedAccount(address account);

    /**
     * @dev The owner is not a valid owner account. (eg. `address(0)`)
     */
    error OwnableInvalidOwner(address owner);

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the address provided by the deployer as the initial owner.
     */
    constructor(address initialOwner) {
        if (initialOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(initialOwner);
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        if (owner() != _msgSender()) {
            revert OwnableUnauthorizedAccount(_msgSender());
        }
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        if (newOwner == address(0)) {
            revert OwnableInvalidOwner(address(0));
        }
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

interface IUniswapV2Pair {
    event Approval(address indexed owner, address indexed spender, uint256 value);
    event Transfer(address indexed from, address indexed to, uint256 value);

    function name() external pure returns (string memory);

    function symbol() external pure returns (string memory);

    function decimals() external pure returns (uint8);

    function totalSupply() external view returns (uint256);

    function balanceOf(address owner) external view returns (uint256);

    function allowance(address owner, address spender) external view returns (uint256);

    function approve(address spender, uint256 value) external returns (bool);

    function transfer(address to, uint256 value) external returns (bool);

    function transferFrom(
        address from,
        address to,
        uint256 value
    ) external returns (bool);

    function DOMAIN_SEPARATOR() external view returns (bytes32);

    function PERMIT_TYPEHASH() external pure returns (bytes32);

    function nonces(address owner) external view returns (uint256);

    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    event Mint(address indexed sender, uint256 amount0, uint256 amount1);
    event Burn(address indexed sender, uint256 amount0, uint256 amount1, address indexed to);
    event Swap(address indexed sender, uint256 amount0In, uint256 amount1In, uint256 amount0Out, uint256 amount1Out, address indexed to);
    event Sync(uint112 reserve0, uint112 reserve1);

    function MINIMUM_LIQUIDITY() external pure returns (uint256);

    function factory() external view returns (address);

    function token0() external view returns (address);

    function token1() external view returns (address);

    function getReserves()
        external
        view
        returns (
            uint112 reserve0,
            uint112 reserve1,
            uint32 blockTimestampLast
        );

    function price0CumulativeLast() external view returns (uint256);

    function price1CumulativeLast() external view returns (uint256);

    function kLast() external view returns (uint256);

    function mint(address to) external returns (uint256 liquidity);

    function burn(address to) external returns (uint256 amount0, uint256 amount1);

    function swap(
        uint256 amount0Out,
        uint256 amount1Out,
        address to,
        bytes calldata data
    ) external;

    function skim(address to) external;

    function sync() external;

    function initialize(address, address) external;
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

library Babylonian {
    function sqrt(uint256 y) internal pure returns (uint256 z) {
        if (y > 3) {
            z = y;
            uint256 x = y / 2 + 1;
            while (x < z) {
                z = x;
                x = (y / x + x) / 2;
            }
        } else if (y != 0) {
            z = 1;
        }
        // else z = 0
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

import "./Babylonian.sol";

// a library for handling binary fixed point numbers (https://en.wikipedia.org/wiki/Q_(number_format))
library FixedPoint {
    // range: [0, 2**112 - 1]
    // resolution: 1 / 2**112
    struct uq112x112 {
        uint224 _x;
    }

    // range: [0, 2**144 - 1]
    // resolution: 1 / 2**112
    struct uq144x112 {
        uint256 _x;
    }

    uint8 private constant RESOLUTION = 112;
    uint256 private constant Q112 = uint256(1) << RESOLUTION;
    uint256 private constant Q224 = Q112 << RESOLUTION;

    // encode a uint112 as a UQ112x112
    function encode(uint112 x) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(x) << RESOLUTION);
    }

    // encodes a uint144 as a UQ144x112
    function encode144(uint144 x) internal pure returns (uq144x112 memory) {
        return uq144x112(uint256(x) << RESOLUTION);
    }

    // divide a UQ112x112 by a uint112, returning a UQ112x112
    function div(uq112x112 memory self, uint112 x) internal pure returns (uq112x112 memory) {
        require(x != 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112(self._x / uint224(x));
    }

    // multiply a UQ112x112 by a uint, returning a UQ144x112
    // reverts on overflow
    function mul(uq112x112 memory self, uint256 y) internal pure returns (uq144x112 memory) {
        uint256 z;
        require(y == 0 || (z = uint256(self._x) * y) / y == uint256(self._x), "FixedPoint: MULTIPLICATION_OVERFLOW");
        return uq144x112(z);
    }

    // returns a UQ112x112 which represents the ratio of the numerator to the denominator
    // equivalent to encode(numerator).div(denominator)
    function fraction(uint112 numerator, uint112 denominator) internal pure returns (uq112x112 memory) {
        require(denominator > 0, "FixedPoint: DIV_BY_ZERO");
        return uq112x112((uint224(numerator) << RESOLUTION) / denominator);
    }

    // decode a UQ112x112 into a uint112 by truncating after the radix point
    function decode(uq112x112 memory self) internal pure returns (uint112) {
        return uint112(self._x >> RESOLUTION);
    }

    // decode a UQ144x112 into a uint144 by truncating after the radix point
    function decode144(uq144x112 memory self) internal pure returns (uint144) {
        return uint144(self._x >> RESOLUTION);
    }

    // take the reciprocal of a UQ112x112
    function reciprocal(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        require(self._x != 0, "FixedPoint: ZERO_RECIPROCAL");
        return uq112x112(uint224(Q224 / self._x));
    }

    // square root of a UQ112x112
    function sqrt(uq112x112 memory self) internal pure returns (uq112x112 memory) {
        return uq112x112(uint224(Babylonian.sqrt(uint256(self._x)) << 56));
    }
}

// SPDX-License-Identifier: UNLICENSED
pragma solidity 0.8.28;

import "./FixedPoint.sol";
import "../interfaces/IUniswapV2Pair.sol";

// library with helper methods for oracles that are concerned with computing average prices
library UniswapV2OracleLibrary {
    using FixedPoint for *;

    // helper function that returns the current block timestamp within the range of uint32, i.e. [0, 2**32 - 1]
    function currentBlockTimestamp() internal view returns (uint32) {
        return uint32(block.timestamp % 2**32);
    }

    // produces the cumulative price using counterfactuals to save gas and avoid a call to sync.
    function currentCumulativePrices(address pair)
    internal
    view
    returns (
        uint256 price0Cumulative,
        uint256 price1Cumulative,
        uint32 blockTimestamp
    )
    {
        blockTimestamp = currentBlockTimestamp();
        price0Cumulative = IUniswapV2Pair(pair).price0CumulativeLast();
        price1Cumulative = IUniswapV2Pair(pair).price1CumulativeLast();

        // if time has elapsed since the last update on the pair, mock the accumulated price values
        (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast) = IUniswapV2Pair(pair).getReserves();
        if (blockTimestampLast != blockTimestamp) {
            // subtraction overflow is desired
            uint32 timeElapsed = blockTimestamp - blockTimestampLast;
            // addition overflow is desired
            // counterfactual
            price0Cumulative += uint256(FixedPoint.fraction(reserve1, reserve0)._x) * timeElapsed;
            // counterfactual
            price1Cumulative += uint256(FixedPoint.fraction(reserve0, reserve1)._x) * timeElapsed;
        }
    }
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/access/Ownable.sol";

abstract contract Operator is Context, Ownable {
    address private _operator;

    event OperatorTransferred(address indexed previousOperator, address indexed newOperator);

    constructor() Ownable(_msgSender()) {
        _operator = _msgSender();
        emit OperatorTransferred(address(0), _operator);
    }

    function operator() public view returns (address) {
        return _operator;
    }

    modifier onlyOperator() {
        require(_operator == msg.sender, "operator: caller is not the operator");
        _;
    }

    function isOperator() public view returns (bool) {
        return _msgSender() == _operator;
    }

    function transferOperator(address newOperator_) public onlyOwner {
        _transferOperator(newOperator_);
    }

    function _transferOperator(address newOperator_) internal {
        require(newOperator_ != address(0), "operator: zero address given for new operator");
        emit OperatorTransferred(_operator, newOperator_);
        _operator = newOperator_;
    }

    function _renounceOperator() public onlyOwner {
        emit OperatorTransferred(_operator, address(0));
        _operator = address(0);
    }
}

// SPDX-License-Identifier: MIT

pragma solidity 0.8.28;

import '../owner/Operator.sol';

contract Epoch is Operator {
    uint256 private period;
    uint256 private startTime;
    uint256 private lastEpochTime;
    uint256 private epoch;

    /* ========== CONSTRUCTOR ========== */

    constructor(
        uint256 _period,
        uint256 _startTime,
        uint256 _startEpoch
    ) {
        period = _period;
        startTime = _startTime;
        epoch = _startEpoch;
        lastEpochTime = startTime - period;
    }

    /* ========== Modifier ========== */

    modifier checkStartTime {
        require(block.timestamp >= startTime, 'Epoch: not started yet');

        _;
    }

    modifier checkEpoch {
        uint256 _nextEpochPoint = nextEpochPoint();
        if (block.timestamp < _nextEpochPoint) {
            require(msg.sender == operator(), 'Epoch: only operator allowed for pre-epoch');
            _;
        } else {
            _;

            for (;;) {
                lastEpochTime = _nextEpochPoint;
                ++epoch;
                _nextEpochPoint = nextEpochPoint();
                if (block.timestamp < _nextEpochPoint) break;
            }
        }
    }

    /* ========== VIEW FUNCTIONS ========== */

    function getCurrentEpoch() public view returns (uint256) {
        return epoch;
    }

    function getPeriod() public view returns (uint256) {
        return period;
    }

    function getStartTime() public view returns (uint256) {
        return startTime;
    }

    function getLastEpochTime() public view returns (uint256) {
        return lastEpochTime;
    }

    function nextEpochPoint() public view returns (uint256) {
        return lastEpochTime + period;
    }

    /* ========== GOVERNANCE ========== */

    function setPeriod(uint256 _period) external onlyOperator {
        require(_period >= 1 hours && _period <= 48 hours, '_period: out of range');
        period = _period;
    }

    function setEpoch(uint256 _epoch) external onlyOperator {
        epoch = _epoch;
    }
}

{
  "optimizer": {
    "enabled": true,
    "runs": 999999
  },
  "evmVersion": "paris",
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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0000000000000000000000009f3e35fc18c93314a8d74bbc6c648d8ebdffa8cf000000000000000000000000d1f4414c66e5e046635a179143820f4cbf0d3d3b00000000000000000000000000000000000000000000000000000000000070800000000000000000000000000000000000000000000000000000000067beca00

-----Decoded View---------------
Arg [0] : _pair (address): 0x9F3e35fC18C93314A8D74bBC6c648d8EBDFFa8Cf
Arg [1] : _green (address): 0xd1F4414c66E5e046635A179143820f4CBf0D3D3b
Arg [2] : _period (uint256): 28800
Arg [3] : _startTime (uint256): 1740556800

-----Encoded View---------------
4 Constructor Arguments found :
Arg [0] : 0000000000000000000000009f3e35fc18c93314a8d74bbc6c648d8ebdffa8cf
Arg [1] : 000000000000000000000000d1f4414c66e5e046635a179143820f4cbf0d3d3b
Arg [2] : 0000000000000000000000000000000000000000000000000000000000007080
Arg [3] : 0000000000000000000000000000000000000000000000000000000067beca00